PhilT

Seems I was completely wrong about this I must have taken a measurement when the compressor heating was at that moment not required. The compressor temperature is maintained while idle and my heat pump uses between 4 and 6 kWh per day when switched on but not heating either radiators or DHW. Mitsubishi tech support say although the manual specifies a 12 hour wait between switching on and use this can in fact be as little as 4 hours without any problem. TBH I can't see why it should take 12 or even 4 hours to simply heat up the compressor - anyone know why it has to be such a long wait?

I have an Ecodan 11.2kW. I switched off my main consumer unit leaving just the dedicated supply for the Ecodan pump and control system running at 24W background idle, agreeing with previous posts. Must be the control system. Whatever the standby consumtion may be, all I know is that in its first full year it has produced absolutely stunning results - 3,600kWh of electricity consumption for the year compared to 21,000kWh worth of gas the previous year. I'm having trouble believing the figures but if real that's certainly one way to help solve the energy crisis!!!